Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
out of index
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "out of index" is not commonly used in standard written English and may be considered incorrect in certain contexts.
It can be used in technical contexts, particularly in computing or data management, to indicate that something is not found within a specified index. Example: "The system returned an error message stating that the requested file is out of index and cannot be retrieved."
News & Media
Science
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
7 human-written examples
Mr. Wright brought a guidebook to gay Berlin, Mr. Mays spent most of the night creating tiny dollhouse furniture out of index cards, and Mr. Kaufman borrowed a "simple, elegant, tea-length" dress, which he then wore to rehearsal.
News & Media
Moreover, my favorite and most memorable activity in class was actually through PLTW's Introduction to Engineering Design where my team was instructed to build a structure out of index cards and tape that could hold the most weight.
News & Media
It spun out of Index Ventures in 2016.
News & Media
I get a lot of value out of index cards.
Science & Research
Index Seed is being carved out of Index's existing $400 million fund.
News & Media
There are 10 Active communities with 600-plus active members out of Index's 135 companies.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
51 human-written examples
We have chosen to use the memory-map file approach rather than implementing an out-of-core indexing algorithm because of the ease of programming using the memory-map abstraction for the persistent storage of data structures.
Science
-Don't switch out of an index fund that you have owned for a long time, just because a capital gain distribution is a risk.
News & Media
Somewhere near the book's end I found this page Dad apparently ripped out of the index of a cookbook and stuffed into How to be Alone.
News & Media
We evaluated the intensity of repeat filtering by comparing the number of genomic words kept out of the index.
Science
The films displayed negative birefringence, i.e. their in-plane refractive indices (n∥) were higher than their out-of-plane refractive indices (n⊥).
Science
Expert writing Tips
Best practice
When using "out of index" in technical writing, clearly define the index to avoid ambiguity. For instance, specify whether you're referring to a database index, an array index, or another type of index.
Common error
Avoid using "out of index" in general writing where simpler terms like "missing" or "not included" would suffice. This phrase is best reserved for technical contexts where indices are explicitly relevant.
Source & Trust
84%
Authority and reliability
3.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "out of index" functions as a prepositional phrase that modifies a noun, indicating a state of being outside a defined indexing system. As Ludwig AI points out, it can be interpreted differently depending on the technical or general contexts.
Frequent in
Science
50%
News & Media
50%
Formal & Business
0%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "out of index" is a prepositional phrase predominantly used in technical contexts to indicate that something is not found within a defined index. While grammatically acceptable, its usage should be reserved for scenarios where indices are explicitly relevant, as supported by the examples found in Ludwig. Ludwig AI classifies it as acceptable and provides valuable usage examples. Simpler alternatives like "not indexed" or "missing from the index" may be preferable in general writing, aligning with best practices for clarity and precision in communication.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
not indexed
Indicates that an item has not been included in an index or catalog.
missing from the index
Highlights the absence of a specific item within an established index.
beyond the bounds
Implies something is outside the defined limits or scope.
outside the scope
Emphasizes that something falls outside the specified area of consideration.
excluded from the list
Indicates a deliberate removal or non-inclusion from a list.
not in the compilation
Refers to an item's absence from a collected group or data set.
not accounted for
Suggests an item hasn't been registered or considered in a particular context.
off the register
Indicates removal or absence from an official record or list.
non-existent in the database
Specifically denotes absence from a digital storage system.
invalid index
Describes an index entry that is not correct or no longer functional.
FAQs
What does "out of index" mean in a technical context?
In technical fields like computer science, "out of index" typically means that a program is trying to access an element in a data structure (like an array or list) using an "invalid index". This usually results in an error.
When is it appropriate to use "out of index"?
Use "out of index" when discussing technical issues related to data structures, databases, or search algorithms. It's not suitable for general writing; instead, use alternatives such as "missing from the index" or "not indexed".
Are there simpler alternatives to "out of index" for non-technical contexts?
Yes, in general writing, you can use phrases like "not included", "missing", or "excluded" instead of "out of index".
How do I avoid errors related to "out of index" in programming?
Always validate the index value before accessing an element in a data structure. Ensure that the index is within the valid range (e.g., 0 to array size - 1) to prevent "invalid index" errors.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
3.8/5
Expert rating
Real-world application tested